Lock for door-bolts.



W. G. BRINKBRHOPF. LOOK FOR DOOR BOLTS. APPLICATION FILED FEB. 26, 1914.

Patented J an. 26, 1915.

4 Fly- 5 RUeYZZOW Z??? 7 7 71: r730 W 5? w wi WW .1 w?

WILLIAM C. BRINKERHOFF, OF CHICAGO, ILLINOIS.

LOOK FOR DOOR-BOLTS.

Specification of Letters Patent.

Patented Jan. 26, 1915.

Application filed February 26, 191 1. Seria1No. 821,161.

T 0 all whom it may concern I Be it known that I, IVILLIAM O. BRINKER- now, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Looks for Door Bolts, of which the following is a specification.

With many common forms of door locks, numerous locks may be opened with the same key, or a skeleton key made, which would readily turn various locks. Better grades of locks are also made which are commonly used for oifice locks, and which are arranged so that the lock can be adjusted so that it can be turned with the knob from the outside at certain times, or can only be turned from the outside with a key. In such instances, any one having a key can, of course, enter the room. Where extreme privacy is desired, as for instance in a surgeons operating room, it is at times objectionable to have the door opened even by those having'keys and ordinarily authorized to enter the room.

Among the objects of the present invention are to provide a simple and efiicient lock which may be used to fasten a door bolt or catch, so that the bolt cannot be moved from looking position until the lock is removed. This will make ordinary forms of locks more effective against unauthorized opening, and will also prevent the untimely opening of doors under the circumstances above suggested.

Other objects and advantages of my improved device will be more fully described hereinafter.

In the accompanying drawings illustrating my invention: Figure 1 is an elevation showing a door bolt provided with my mproved looking device; Fig. 2 is a side view of the same; Fig. 3 is a view similar to Fig. 2, but showing a modified form of construction; Fig. 4 shows a still further modification; and Fig. 5 shows the look as arranged in close fitting doors.

As illustrated in these drawings, 5 represents a door which is provided with any ordinary or preferred form of lock having a bolt or catch 6 which extends out beyond the face plate 7, or edge of the door when in looking position. There is usually a small space between the door and the amb when the door is closed. In order to hold the bolt 6 in looking position I provide a hole 8 in the bolt, which hole is adjacent to the edge of the door and in alinement with the opening between the door and jamb. This hole may be formed in the bolt at the time the lock is made, or may be readily drilled in looks which are in use, and is preferably pitched slightly downwardly and extends only partially through the bolt from the side which corresponds with the inside of the room. A pin 9 is made to fit in a hole 8 and is preferably provided with a short chain or cord 10, which connects with a screw 11 having a hook 12 upon which the pin may be supported when not in use. When the door is closed and the bolt or catch (3 is in looking position, the pin 9 may be inserted in the hole 8 and will effectively prevent the bolt from being drawn, thereby holding it positively in looking position. The downward pitch of the hole will prevent the pin from being rattled or shaken out of place, as any movement thereof will tend to cause it to seat more firmly in the hole. Vhen such pin is in position, any one in the room will be free from intrusion the door cannot be opened until the pin is removed. It will be observed that the bolt with which the pin engages may be either the ordinary catch or the locking bolt, or the part in some locks which performs both of these functions.

. hen the door fits closely to the jamb as is frequently required with new doors, there may not be sufficient room between them for inserting a pin. In such case, I provide the striking plate 21, as shown in Fig. 5, with a recess or groove 22 through which the pin may be inserted. This recess is preferably made sufiiciently long to permit the pin to be inserted. even if the door has slightly sagged or changed from its original closing position. In some cases, the groove may be made in the door as indicated at 23, but is preferably placed in the striking piece.

In the modified form of construction shown in Fig. 3, the bolt 13 is provided with a threaded hole 14: for receiving a threaded pin 15 which pin may be screwed into position to insure its more positive retention, but such screw threads will not ordinarily be necessary.

In the modification shown in Fig. 1, the bolt 16 is provided with a vertical hole 17 and the locking member 18 is provided with a short projection 19 for engagement with the hole, and another projection 20 which rests against the lower side of the bolt for device is to be removed or inserted, the handle portion of the locking member 18 is pressed so that the sides approach each other, and therebv open the projections 19.

and 20, a sufficient distance to permit the projection 19 to be withdrawn from, or inserted in the hole. 7

From this description it will be seen that one of the principal features of my inven tion is the provision of an aperture in the bolt, whereby a locking member may be inserted which will positively hold the bolt in looking position, and such arrangement may be modified to suit diiierent conditions and therefore, I do not wish to limit myself to the exact construction shown, except as specified in the appended claims, in which I claim- 1. The combination with a door bolt hav ing a hole therein adapted to register with the edge of the door when the bolt is in locking position, of a pin for engagement with the hole and edge of the door for locking the bolt in its projected position.

2. The combination of a door lock having a bolt provided with a hole between the edge of the door and the amb, said hole being pitched downwardly from the side of the bolt next to the interior of the room and extending only partially through the bolt, with a pin adapted to be inserted in said hole and engaging with the edge of the door when inserted therein.

The combination with a door provided with a lock, having a bolt with a round hole therein which is adjacent to the edge of the door when in looking position, of a pin for engagement with the hole and the edge of the door for holding the bolt in locking position, a supporting member secured to the door, and a fastening device between said member and the pin.

4. The combination with a door bolt or the like, 'havin'ga threaded hole therein adj acent to the edge of the door when the bolt is inlocking position, of a threaded pin for engagement with said holeand -with the edge of the door for holding the bolt in locking position. V r

5; The combination with a door bolt or the like, having a hole therein adjacent to the edge of the door when the bolt is in looking position, of a yielding locking device adapted to be inserted between the door and the jamb, and having a projection for engagement with the hole. 1

6. The combination of a door bolt, having a hole therein, a striking piece having a recess in its outer iaceregistering with said hole, when the bolt isin locking position, and a pin for engagement with said hole and with the edge of the door for holding the bolt'in locking position.

7. The combination with adoor and j amb with a recess between them, of a locking bolt having a hole therein registering with said recess when the bolt is in looking position, and a pin for insertion in said hole.

lVILLIAM C. BR'INKERHOFF. \Vitnesses: V MYRTLE Bannow,

IRENE Fonnnsr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

7 I Washington, D. C. I 

